PUBLISHED: 07:43, Thu, Nov 5, 2020 | UPDATED: 07:48, Thu, Nov 5, 2020
However, he was met with furious "protests and anguish", the Prince of Wales recalled.
He told Vogue: "Thirty years or so ago, I decided to look at those companies that apply for my warrant, where they put 'By Appointment To' up outside their shop with a coat of arms.
"And I said, you’re not going to get my warrant anymore unless you conform to the following – in those days, pretty basic – environmental requirements.
"And there were howls of protest and anguish and gnashing of teeth and they all said, 'It’ll ruin our businesses'.
Prince Charles spoke about his sense of style in a recent interview (Image: GETTY)
"I said, 'Sorry, we have to do it.'
"So of course, they went away, looked at their supply chains, looked at the way they did things.
"Lo and behold, they came back and said, 'Well, actually, it’s saved us money and made us money – to do it in a better way'."
Prince Charles's interview with Mr Enninful will be